07-01-2008
unix time is kept by the kernel as 'epoch' seconds elapsed since Jan 1, 1970. All of the date functions and commands reference epoch seconds. You cannot set epoch seconds for one process. You can only trick some commands into thinking you are in a weird timezone, so that you can "go" backwards/forwards as much as 24 hours. No more because the length of a day is 24 hours. And you are not changing epoch seconds, just how they are interpreted.
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LEARN ABOUT FREEBSD
getdate
GETDATE(1) User Commands GETDATE(1)
NAME
getdate - AME
SYNOPSIS
[-dv][-n dec][-f format] [ra dec sys] itype2otype [date and/or time]
DESCRIPTION
Convert date and time between various formats
[-dv][-n dec][-f format] itype2otype @file
itype: nfd=ISOFITS fd=FITS, dt=yyyy.mmdd, hr=hh:mm:ss, deg=dd:mm:ss
jd=Julian Date, mjd=Modified Julian Date hjd=Heliocentric Julian Date, mhjd=Modified HJD ep=epoch, epj=Julian epoch, epb=Besselian
epoch lt=local time, ut=UT, ts=seconds since 1950-01-01 now=current time, ang=fractional degrees
otype: fd=FITS, dt=yyyy.mmdd, jd=Julian Date, mjd=Modified Julian Date
hjd=Heliocentric Julian Date, mhjd=Modified HJD hr=hh:mm:ss, deg=dd:mm:ss, ang=fractional degrees ep=epoch, epj=Julian epoch,
epb=Besselian epoch ts=seconds since 1950-01-01, tsu=Unix sec, tsi=IRAF sec gst=Greenwich Sidereal Time, lst=Local Sidereal Time
@file: First one or two columns are in itype format ra dec sys: Need for Heliocentric conversions
-a: Append date to input file, if there is one
-d: Print date without time
-e: Print output as ET/TDT/TT converting from UT
-f: Format for output number (C printf)
-h hours: Longitude in hours, west positive
-l degrees: Longitude in degrees, west positive
-n: Number of decimal places in sec, epoch, JD
-t: Print time without date
-v: Verbose
getdate 3.8.4 June 2012 GETDATE(1)